Unity Connecting Module

1998.
The Unity module inside the shuttle payload bay of Space Shuttle Endeavour.
Endeavour was scheduled to fly on mission STS-88, the first Space Shuttle
flight for the assembly of the International Space Station, on December
3, 1998. The primary payload on the mission was the Unity connecting module,
which was mated to the Russian-built Zarya Control Module already in orbit
at that time.